Founding member and 1985-1986 President of the International Society for the Study of Multiple Personality and Dissociation, which later changed name to the International Society for the Study of Trauma and Dissociation.
A highly influential early proponent of Multiple Personality Disorder, described by author Mark Pendergast as "the acknowledged master of the 'scientific' presentation of MPD, writing about the 'polysymptomatic pleomorphic presentation of MPD' — by which he means that he interprets almost any behavior as evidence of possible MPD."
Believes there is a hidden epidemic of thousands, if not more, undiagnosed cases of Dissociative Identity Disorder, per his 2009 interview on CBS "Sunday Morning."
Has settled two malpractice lawsuits: Marietti, et al., v. Kluft, Dissociative Disorders Program and Institute of the Pennsylvania Hospital, Ct. of Common Pleas, Phila. Co., Penn., No. 9509-02260. Settled for an undisclosed amount.
Helped produce videotape "Ritual Child Abuse: A Professional Overview" (Cavalcade Productions 1989), a training video to help therapists identify and treat now debunked Satanic Ritual Abuse.